基于BTC与秘密共享的图像水印算法

结合块截短编码与秘密共享，提出一种新的鲁棒图像水印算法。该算法利用BTC编码由原图像构建特征共享，利用水印图像与特征共享一起生成私有共享。由待验证图像构建的特征共享与私有共享一起恢复水印图像。私有共享的生成与特征共享有关，可实现对同一图像的多水印注册。特征共享的稳健性确保了算法的水印鲁棒性，水印嵌入没有引起图像质量的改变。实验结果表明该算法对一般信号处理攻击有较高的鲁棒性。

Image Watermark Algorithm Based on BTC and Secret Sharing

A novel robust image watermark technology is presented by combining Block Truncation Coding(BTC) and secret sharing. The feature share of the original image constructed by BTC is combined with the watermark to generate the private share. In watermark extraction, the watermark can be retrieved by XOR operation between the private share and the feature share from the suspected image. The private share is dependent of the feature share, and it is possible to register multiple watermarks for a single host image, and the robustness of the feature share ensures the robustness of the watermark algorithm. This algorithm does not alter the host image when the private share is generated. Experimental results show high robustness of the proposed algorithm against common signal processing attacks.